CompanyGraph

describe_schema

One type's schema: its sections as written and its declared relations as data. Use to learn what an entity of the type may hold; for the whole vocabulary use describe_relations. Input: type. Returns url, the schema's own file, sections, and relations: owner, owns, references both ways, enums, joins and lists.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`type`	Yes	A type name from list_types, such as skill

Output Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes
`name`	Yes
`type`	Yes
`model`	Yes
`tagline`	Yes
`sections`	Yes
`relations`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedSep 21, 2026

addedOutput schema / properties / url

Added value: +{
+  "type": [
+    "string",
+    "null"
+  ]
+}

changedOutput schema / required

Previous value: -[
-  "type",
-  "name",
-  "tagline",
-  "sections",
-  "relations",
-  "model"
-]New value: +[
+  "type",
+  "name",
+  "tagline",
+  "url",
+  "sections",
+  "relations",
+  "model"
+]

Changed7 schema fields changedSep 21, 2026

changedOutput schema / additionalProperties
```
Previous value: -{}New value: +false
```
addedOutput schema / properties / name
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / properties / relations

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "enums": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {
+          "required": {
+            "type": "boolean"
+          },
+          "tokens": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "via": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "via",
+          "tokens",
+          "required"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "joins": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {
+          "kind": {
+            "type": "string"
+          },
+          "section": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind",
+          "section"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "lists": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {
+          "kind": {
+            "type": "string"
+          },
+          "min": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          "required": {
+            "type": "boolean"
+          },
+          "section": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "section",
+          "kind",
+          "required",
+          "min"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "owner": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "owns": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "referencedBy": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "array": {
+            "type": "boolean"
+          },
+          "form": {
+            "enum": [
+              "ref",
+              "ref?",
+              "qualifier"
+            ],
+            "type": "string"
+          },
+          "from": {
+            "type": "string"
+          },
+          "max": {
+            "anyOf": [
+              {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "min": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          "required": {
+            "type": "boolean"
+          },
+          "via": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "from",
+          "via",
+          "form",
+          "array",
+          "required",
+          "min",
+          "max"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "references": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "array": {
+            "type": "boolean"
+          },
+          "form": {
+            "enum": [
+              "ref",
+              "ref?",
+              "qualifier"
+            ],
+            "type": "string"
+          },
+          "max": {
+            "anyOf": [
+              {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "min": {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          "required": {
+            "type": "boolean"
+          },
+          "to": {
+            "type": "string"
+          },
+          "via": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "via",
+          "to",
+          "form",
+          "array",
+          "required",
+          "min",
+          "max"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "owner",
+    "owns",
+    "references",
+    "referencedBy",
+    "enums",
+    "joins",
+    "lists"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / sections

Added value: +{
+  "items": {
+    "additionalProperties": {},
+    "properties": {
+      "heading": {
+        "type": "string"
+      },
+      "tables": {
+        "items": {
+          "additionalProperties": {},
+          "properties": {
+            "columns": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "rows": {
+              "items": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "columns",
+            "rows"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "text": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "heading",
+      "text",
+      "tables"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

addedOutput schema / properties / tagline
```
Added value: +{
+  "type": "string"
+}
```
addedOutput schema / properties / type
```
Added value: +{
+  "type": "string"
+}
```

changedOutput schema / required

Previous value: -[
-  "model"
-]New value: +[
+  "type",
+  "name",
+  "tagline",
+  "sections",
+  "relations",
+  "model"
+]

First observedSep 21, 2026

TDQS

A4.7/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden, and it delivers: it specifies the return fields (url, sections, relations) and even characterizes the data nuance ('sections as written' and 'declared relations as data'). No side effects or contradictions are present.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is two tight sentences: it front-loads the core purpose, gives the alternative, then lists input and output. Every clause earns its place with no filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a one-parameter read-oriented tool with an output schema present, the description provides all necessary context: purpose, alternative, parameter pointer, and return composition. Nothing an agent needs to invoke it correctly is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The single parameter is already fully documented in the schema ('A type name from list_types, such as skill'), so the description's 'Input: type' adds no new semantic value. Baseline 3 is appropriate because the schema covers the parameter completely.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool exposes one type's schema, and explicitly separates it from describe_relations ('for the whole vocabulary use describe_relations'). An agent can distinguish this tool from its siblings immediately.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives an explicit when-to-use condition ('Use to learn what an entity of the type may hold') and names the alternative for the broader vocabulary case. This is clear routing guidance with minimal ambiguity.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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